Most molecular QC discussions focus on whether a control passed or failed. But every panel shares one hidden dependency: the assumption that a passing control actually tested the whole workflow. Here’s what full-process molecular QC actually means, and how to know if your current control is leaving a gap.
01
What is full-process molecular QC?
A control that challenges every step of a molecular assay: cell lysis, nucleic acid extraction, purification and removal of inhibitors, amplification and detection. It uses intact, inactivated organisms suspended in a patient-like matrix, rather than testing only the amplification or detection step.
02
Why does it matter?
A failure at any workflow step can mean a missed diagnosis or the wrong treatment. If your current control only checks the easy part, amplification and detection, it isn’t meeting the standard CAP, CLSI and ASM increasingly expect: validation of the complete sample-to-result process.
03
How is this different from a synthetic nucleic acid control?
Synthetic controls use engineered sequences that enter the workflow at amplification, bypassing lysis and extraction entirely. If that’s what you’re running today, it can’t catch a failure at the most upstream and most consequential steps of the process.
04
How is full-process QC different from a pellet- or swab-based control?
Pellet- or swab-based controls may contain intact organisms but typically require reconstitution, frozen storage and a thaw window before every run. That cold-chain dependency is exactly what a room-temperature, full-process control removes.
05
Which regulatory and accreditation bodies recommend full-process controls?
CLIA (42CFR493.1250.), CAP (MOL.34220, MOL.34229, MOL.34270, MOL.34311), CLSI (MM06-A2 Section 7.4.1) and ASM all recommend full-process external quality controls that challenge every step from lysis through detection.
06
Do full-process controls require refrigeration or freeze-thaw cycles?
No, not all will require freeze-thaw cycles, and that’s the point of switching. Streck’s molecular QC controls are formulated for room-temperature storage (product-specific ranges apply, for example, 2 °C – 25 °C or 15 °C – 30 °C), removing the freeze-thaw cycles that add logistics risk and can degrade nucleic acids in frozen or pellet-format controls.
07
How often should I run molecular QC?
Frequency should follow your laboratory’s SOPs and accreditation requirements (CLIA, CAP or other standards). Most laboratories run QC with each new lot of reagents, after instrument maintenance or calibration, and at regular intervals: daily, weekly or per manufacturer recommendation.
